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MagpieRSS::concat( $str1, $str2 = "" )

Source

function concat (&$str1, $str2="") {
	if (!isset($str1) ) {
		$str1="";
	}
	$str1 .= $str2;
}

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/magpierss/concat